Optical image capturing system

Abstract

The optical imaging system includes: a first lens group including one or more lenses and having a positive refractive power; a second lens group including a plurality of lenses; and a reflective member disposed between the first lens group and the second lens group, and including an incident surface, a reflective surface, and an exit surface. The optical imaging system satisfies 1.3 lt; sD1 / SDPlt; 1.7 where SD1 is an effective diameter of an object side surface of a first lens disposed closest to an object side among the one or more lenses of the first lens group, and SDP is a minor axis length of an incident surface of the reflective member.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of priority from Korean Patent Application No. 10-2024-0064110 filed on May 16, 2024, in the Korean Intellectual Property Office, and Korean Patent Application No. 10-2023-0176971 filed on December 7, 2023, in the Korean Intellectual Property Office, the disclosures of which are incorporated herein by reference in their entirety for all purposes. Technical Field

[0003] The present disclosure relates to optical imaging systems. Background Art

[0004] The portable terminal may include a camera having an optical imaging system with multiple lenses to enable video calling and image capturing.

[0005] Portable terminals may be designed to include cameras having reduced sizes; therefore, it may be desirable to develop optical imaging systems having small sizes but high resolution.

[0006] In order to implement a camera for a portable terminal with a telephoto characteristic, the optical axes of multiple lenses can be set to be parallel to the length direction or width direction of the portable terminal, and a reflective member can be set on the front side of the multiple lenses so that the total track length of the optical imaging system does not affect the thickness of the portable terminal.

[0007] However, in this structure, as the diameters of the plurality of lenses increase, the thickness of the portable terminal may also increase.

[0008] The above information is presented as background information only to assist with an understanding of the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with respect to the present disclosure. Utility Model Content

[0009] This Summary is provided to introduce a selection of concepts in a concise form, and these concepts will be further described in the Detailed Description below. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

[0010] In one general aspect, an optical imaging system includes: a first lens group including one or more lenses and having a positive refractive power; a second lens group including a plurality of lenses; and a reflecting member disposed between the first lens group and the second lens group and including an incident surface, a reflecting surface, and an exit surface. The optical imaging system satisfies 1.3 < SD1 / SDP < 1.7, where SD1 is the effective diameter of the object surface of the first lens disposed closest to the object side among one or more lenses of the first lens group, and SDP is the short-axis length of the incident surface of the reflecting member.

[0011] The reflecting member and the first lens group can be configured to rotate together about two axes perpendicular to each other.

[0012] The two axes can be perpendicular to the optical axis of the second lens group.

[0013] The optical imaging system can satisfy 2.1 < f / SDP < 2.4, where f is the total focal length of the optical imaging system.

[0014] The optical imaging system can satisfy 0.6 < IMG HT / BFL < 0.8, where IMG HT is half of the diagonal length of the imaging surface, and BFL is the distance from the image surface of the lens disposed closest to the imaging surface among the plurality of lenses of the second lens group to the imaging surface.

[0015] The optical imaging system can satisfy 0.2 < |R10 / f| < 0.5, where R10 is the radius of curvature of the image surface of the lens disposed closest to the imaging surface among the plurality of lenses of the second lens group, and f is the total focal length of the optical imaging system.

[0016] The optical imaging system can satisfy 1.0 < Lf / IMG HT < 1.5, where Lf is the distance from the object surface of the first lens to the reflecting surface of the reflecting member, and IMG HT is half of the diagonal length of the imaging surface.

[0017] The optical imaging system can satisfy 4.0 < fG1 / f < 8.0, where fG1 is the focal length of the first lens group, and f is the total focal length of the optical imaging system.

[0018] The optical imaging system can satisfy |(R1 - R2) / (R1 + R2)| < 0.4, where R1 is the radius of curvature of the object surface of the first lens, and R2 is the radius of curvature of the image surface of the first lens.

[0019] The optical imaging system can satisfy 1.2 < SD1 / BFL < 1.9, where BFL is the distance from the image surface of the lens disposed closest to the imaging surface among the plurality of lenses of the second lens group to the imaging surface.

[0020] The optical imaging system can satisfy 0.9 < CT5 / ET5 < 1.8, where CT5 is the thickness on the optical axis of the lens closest to the imaging surface among the multiple lenses of the second lens group, and ET5 is the thickness at the end of the effective diameter of the lens closest to the imaging surface among the multiple lenses of the second lens group.

[0021] The Abbe number of the first lens is greater than the Abbe number of the reflecting member.

[0022] The second lens group can have a positive refractive power, and the focal length of the second lens group can be less than the focal length of the first lens group.

[0023] The optical imaging system can satisfy 4 < fG1 / fG2 < 8, where fG1 is the focal length of the first lens group, and fG2 is the focal length of the second lens group.

[0024] The lens closest to the reflecting member among the multiple lenses of the second lens group has a positive refractive power.

[0025] The first lens group includes a first lens, and the object side surface of the first lens is convex, and the image side surface of the first lens is concave.

[0026] Other features and aspects will be apparent from the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a configuration diagram showing an optical imaging system according to a first embodiment of the present disclosure.

[0028] Figure 2 is a representation Figure 1 of the aberration characteristics of the optical imaging system shown in

[0029] Figure 3 is a configuration diagram showing an optical imaging system according to a second embodiment of the present disclosure.

[0030] Figure 4 is a representation Figure 3 of the aberration characteristics of the optical imaging system shown in

[0031] Figure 5 is a configuration diagram showing an optical imaging system according to a third embodiment of the present disclosure.

[0032] Figure 6 is a representation Figure 5 of the aberration characteristics of the optical imaging system shown in

[0033] Figure 7 is a configuration diagram illustrating an optical imaging system according to a fourth embodiment of the present disclosure.

[0034] Figure 8 Yes Figure 7 Graph showing the aberration characteristics of the optical imaging system shown in .

[0035] Figure 9 is a configuration diagram showing an optical imaging system according to a fifth embodiment of the present disclosure.

[0036] Figure 10 Yes Figure 9 Graph showing the aberration characteristics of the optical imaging system shown in .

[0037] Figure 11 is a configuration diagram showing an optical imaging system according to a sixth embodiment of the present disclosure.

[0038] Figure 12 Yes Figure 11 Graph showing the aberration characteristics of the optical imaging system shown in .

[0039] Throughout the drawings and detailed description, unless otherwise described, the same reference numerals refer to the same elements. For purposes of clarity, illustration, and convenience, the drawings may not be drawn to scale, and the relative sizes, proportions, and depictions of elements in the drawings may be exaggerated. DETAILED DESCRIPTION

[0040] Hereinafter, although examples of the present disclosure will be described in detail with reference to the accompanying drawings, it should be noted that the examples are not limited thereto.

[0041] The following detailed description is provided to help the reader gain a comprehensive understanding of the methods, devices and / or systems described herein. However, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent after understanding the present disclosure. For example, the order of operations described herein is merely an example, and except for operations that must occur in a specific order, it is not limited to the order set forth herein, but can be changed, which will be apparent after understanding the present disclosure. In addition, for the sake of clarity and brevity, descriptions of features that are well known in the art may be omitted.

[0042] The features described herein may be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided merely to illustrate some of the many possible ways to implement the methods, devices, and / or systems described herein that will be apparent after understanding the present disclosure.

[0043] Throughout the specification, when an element such as a layer, a region, or a substrate is described as being “on,” “connected to,” or “coupled to” another element, the element may be directly “on,” “connected to,” or “coupled to” the other element, or one or more other elements may be present between the element and the other element. Conversely, when an element is described as being “directly on,” “directly connected to,” or “directly coupled to” another element, there are no other elements between the element and the other element.

[0044] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items; similarly, "at least one" includes any one of the associated listed items and any combination of any two or more items.

[0045] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are used only to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Thus, without departing from the teachings of the examples described herein, a first member, first component, first region, first layer, or first portion mentioned in these examples may also be referred to as a second member, second component, second region, second layer, or second portion.

[0046] Spatially relative terms such as "above," "above," "below," and "below" may be used herein for descriptive convenience to describe the relationship of one element relative to another element as shown in the accompanying drawings. In addition to covering the orientations depicted in the accompanying drawings, these spatially relative terms are intended to cover different orientations of the device in use or operation. For example, if the device in the drawings is flipped, an element described as being "above" or "above" relative to another element will be "below" or "below" relative to the other element. Thus, the term "above" covers both orientations of "above" and "below," depending on the spatial orientation of the device. The device may also be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatially relative terms used herein should be interpreted accordingly.

[0047] The terms used herein are only used to describe various examples and are not intended to limit the present disclosure. Unless the context clearly indicates otherwise, the terms "a," "an," and "the" are intended to include plural forms as well. The terms "include," "comprising," and "having" indicate the presence of the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0048] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the drawings may occur. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0049] It should be noted that herein, use of the word “may” with respect to an example, for example, regarding what an example may include or implement, means that there is at least one example that includes or implements such feature, and all examples are not limited thereto.

[0050] The features of the examples described herein may be combined in various ways that will be apparent after understanding the present disclosure. In addition, although the examples described herein have various configurations, other configurations that will be apparent after understanding the present disclosure are also possible.

[0051] The effective aperture radius of the lens surface is the radius of the portion of the lens surface through which light actually passes, and is not necessarily the radius of the outer edge of the lens surface. The object side of the lens and the image side of the lens can have different effective aperture radii.

[0052] In other words, the effective aperture radius of the lens surface is the distance between the optical axis of the lens surface and the marginal ray of light passing through the lens surface in a direction perpendicular to the optical axis of the lens surface.

[0053] According to an embodiment, the optical imaging system may include a plurality of lenses arranged along an optical axis. The plurality of lenses may be spaced apart from each other by a predetermined distance along the optical axis. As an example, the optical imaging system may include five lenses.

[0054] In each lens, the object-side surface may refer to a surface close to the object side, and the image-side surface may refer to a surface close to the image side. In an embodiment, the unit of the values ​​of the radius of curvature, thickness, distance, and focal length may be millimeters (mm), and the unit of the field of view (FOV) may be degrees.

[0055] In the description related to the shape of the lens of the embodiment, a convex surface may indicate that the paraxial region (narrow region near the optical axis) portion of the surface may be convex, and a concave surface may indicate that the paraxial region portion of the surface may be concave.

[0056] The paraxial region may refer to a relatively narrow region close to the optical axis.

[0057] The imaging plane may refer to a virtual plane on which a focus is formed by an optical imaging system. Alternatively, the imaging plane may refer to one surface of an image sensor that receives light.

[0058] An optical imaging system according to an embodiment may include a plurality of lens groups. As an example, the optical imaging system may include a first lens group and a second lens group.

[0059] The first lens group may include one or more lenses, and the second lens group may include a plurality of lenses.

[0060] In an embodiment, the first lens group may include a first lens, and the second lens group may include a second lens, a third lens, a fourth lens, and a fifth lens. The first to fifth lenses may be arranged in sequence from the object side.

[0061] A plurality of lenses included in the optical imaging system may be spaced apart from each other.

[0062] Furthermore, the optical imaging system may further include a reflective member having a reflective surface configured to change the optical path. The reflective surface of the reflective member may be configured to change the optical path by 90°.

[0063] The reflective member may be disposed between the first lens group and the second lens group.In an embodiment, the reflective member may be disposed between the first lens and the second lens.

[0064] The reflective member may be a mirror or a prism having a reflective surface.

[0065] When the reflective member is implemented as a prism, the reflective member may have a form in which a rectangular parallelepiped or a cube is diagonally divided into two equal parts. The prism may include an incident surface on which light is incident, a reflective surface configured to reflect the light passing through the incident surface, and an exit surface that emits light reflected from the reflective surface.

[0066] The reflective member may include three surfaces each having a quadrilateral shape and two surfaces each having a triangular shape. For example, each of the incident surface, the reflecting surface, and the exit surface of the reflective member may have a quadrilateral shape, and the two side surfaces of the reflective member may have an almost triangular shape.

[0067] The optical axis of the first lens group and the optical axis of the second lens group may be perpendicular to each other. In an embodiment, the optical axis direction of the first lens group may be substantially parallel to the thickness direction of the portable terminal on which the optical imaging system is mounted, and the optical axis direction of the second lens group may be substantially parallel to the length direction or the width direction of the portable terminal.

[0068] By changing the direction of light via a reflective member, the light path can be extended in a relatively narrow space.

[0069] For example, light passing through the first lens may pass through the incident surface of the reflective member, the optical path of the light may change 90° on the reflective surface, the light may pass through the exit surface of the reflective member and may be incident to the second lens.

[0070] Thus, the optical imaging system can have a relatively long focal length while having a reduced size.

[0071] The optical imaging system according to the embodiment may have characteristics of a telephoto lens having a relatively narrow field of view and a relatively long focal length.

[0072] In order to reduce the size of the portable terminal and the optical imaging system, it may be desirable to reduce the diameter of the lens located between the reflective member and the image sensor. However, as the lens diameter decreases, the Fno (F number of the optical imaging system) increases and the image may become darker.

[0073] Therefore, an optical imaging system according to an embodiment can reduce Fno by placing a first lens group having positive refractive power in front of a reflective element. Furthermore, the effective diameter of the lenses included in the first lens group can be larger than the minor axis length of the incident surface of the reflective element. For example, the effective diameters of the object-side and image-side surfaces of the lenses included in the first lens group can be larger than the minor axis length of the incident surface of the reflective element.

[0074] The lenses included in the first lens group may have an almost circular shape when viewed in the optical axis direction of the first lens group.

[0075] A reflective member may be provided on the front side of the second lens group. The reflective member may be rotatable about two axes to stabilize an image during shooting.

[0076] In other words, when shaking occurs due to factors such as hand shaking of a user when acquiring an image or a video, image stabilization can be performed by rotating the reflection member in response to the shaking.

[0077] In an embodiment, the reflecting member can be rotated using the optical axis of the first lens group (or an axis parallel to the axis) as a rotation axis (yaw rotation axis), and can be rotated using an axis perpendicular to both the optical axis of the first lens group and the optical axis of the second lens group (or an axis parallel to the axis) as a rotation axis (pitch rotation axis).

[0078] Since the first lens group, which has positive refractive power, is arranged in front of the reflective member, light incident on the reflective member can be converged, and the diameter of the second lens group can be configured to be small. As a result, the height of the optical imaging system can be reduced, and the Fno of the optical imaging system can also be reduced.

[0079] Furthermore, the first lens group may rotate together with the reflecting member.

[0080] The optical imaging system may further include an image sensor for converting an image of an incident object into an electrical signal.

[0081] In addition, the optical imaging system may further include an infrared cutoff filter (hereinafter referred to as a "filter") to block infrared rays. The filter may be disposed between the second lens group and the imaging surface.

[0082] In addition, the optical imaging system may further include an aperture for controlling the amount of light.

[0083] The effective radius of the first lens may be greater than the effective radius of the other lenses. In other words, the effective radius of the first lens may be the largest among the first to fifth lenses.

[0084] The first lens may have a shape different from that of the other lenses. For example, when viewed along the optical axis, the first lens may have a substantially circular shape, and one or more of the second to fifth lenses may have a non-circular shape. For example, the first lens may have a circular plan view, and the second to fifth lenses may have non-circular plan views.

[0085] In a plane perpendicular to the optical axis, the length of the non-circular lens in a first axial direction perpendicular to the optical axis may be longer than the length in a second axial direction perpendicular to both the optical axis and the first axial direction. For the non-circular lens, the ratio of the length in the second axial direction to the length in the first axial direction may be greater than 0.5 and less than 1.

[0086] For example, the non-circular lens may have a shape in which a part of a circle is cut off when viewed in the optical axis direction.

[0087] Here, the first axis direction may be a direction in which a long side of the image sensor extends, and the second axis direction may be a direction in which a short side of the image sensor extends.

[0088] The length of the non-circular lens in the first axis direction may be longer than the length in the second axis direction, so that the non-circular lens may have a major axis effective radius and a minor axis effective radius.

[0089] In the following tables, "Effective Radius" may refer to the major axis effective radius.

[0090] In an embodiment, the first lens to the fifth lens may be formed of a plastic material.

[0091] One or more of the first lens to the fifth lens may have at least one aspherical surface.

[0092] Here, the aspherical surface of each lens may be represented by Equation 1.

[0093] Equation 1:

[0094]

[0095] In Equation 1, c may be the curvature of the lens (the reciprocal of the radius of curvature), K may be the conic constant, and Y may be the distance from an arbitrary point on the aspherical surface of the lens to the optical axis. In addition, the constants A to H, J, L to P may be aspherical surface coefficients. Z may be the distance in the optical axis direction between an arbitrary point on the aspherical surface of the lens and the vertex of the aspherical surface.

[0096] The optical imaging system according to an embodiment may satisfy one or more of the following conditional expressions.

[0097] In an embodiment, the optical imaging system may satisfy the conditional expression 1.3 < SD1 / SDP < 1.7. Here, SD1 may be the effective diameter of the object side surface of the lens (e.g., the first lens) that is disposed closest to the object side among one or more lenses of the first lens group, and SDP may be the minor axis length of the incident surface of the reflective member. Accordingly, the image brightness may be increased, and the size of the optical imaging system may be reduced.

[0098] In an embodiment, the optical imaging system may satisfy the conditional expression 2.1 < f / SDP < 2.4. Here, f may be the total focal length of the optical imaging system. Since the first lens is disposed on the front side of the reflective member, the size of the reflective member may be reduced, such that the optical imaging system may have a reduced size.

[0099] In an embodiment, the optical imaging system may satisfy the conditional expression 0.6 < IMG HT / BFL < 0.8. Here, IMG HT may be half of the diagonal length of the imaging surface of the image sensor, and BFL may be the distance from the image side surface of the last lens (e.g., the fifth lens) of the second lens group to the imaging surface. Accordingly, the optical imaging system may have sufficient telephoto performance.

[0100] In an embodiment, the optical imaging system may satisfy the conditional expression 0.2 < |R10 / f| < 0.5. Here, R10 may be the radius of curvature of the image side surface of the last lens (e.g., the fifth lens) of the second lens group. Accordingly, the curvature of the field of view may be effectively calibrated.

[0101] In an embodiment, the optical imaging system may satisfy the conditional expression 1.0 < Lf / IMG HT < 1.5. Here, Lf may be the distance from the object side surface of the first lens of the first lens group (e.g., the first lens) to the reflection surface of the reflection member. Thus, the optical imaging system may have a reduced size.

[0102] In an embodiment, the optical imaging system may satisfy the conditional expression 4.0 < fG1 / f < 8.0. Here, fG1 may be the focal length of the first lens group. Thus, by optimizing the focal length of the first lens group, the diameter of the lenses included in the second lens group can be reduced.

[0103] In an embodiment, the optical imaging system may satisfy the conditional expression |(R1 - R2) / (R1 + R2)| < 0.4. Here, R1 may be the radius of curvature of the object side surface of the first lens of the first lens group (e.g., the first lens), and R2 may be the radius of curvature of the image side surface of the first lens of the first lens group (e.g., the first lens). Thus, the spherical aberration occurring in the first lens group can be reduced.

[0104] In an embodiment, the optical imaging system may satisfy the conditional expression 1.2 < SD1 / BFL < 1.9, which can improve the image brightness and allow sufficient telephoto performance and reduce the size of the optical imaging system.

[0105] In an embodiment, the optical imaging system may satisfy the conditional expression 0.9 < CT5 / ET5 < 1.8. Here, CT5 may be the thickness on the optical axis of the last lens of the second lens group (e.g., the fifth lens), and ET5 may be the thickness at the end of the effective diameter of the last lens of the second lens group (e.g., the fifth lens). Thus, the curvature of the field of view can be effectively calibrated.

[0106] In an embodiment, the Abbe number of the first lens may be greater than the Abbe number of the reflection member. Thus, chromatic aberration can be effectively calibrated.

[0107] In an embodiment, the optical imaging system may satisfy the conditional expression 0.25 < D1P / DR < 0.5. Here, D1P may be the distance on the optical axis between the first lens group and the reflection member (the incident surface of the reflection member). For example, D1P may be the distance on the optical axis from the image side surface of the first lens to the incident surface of the reflection member. DR may be the distance on the optical axis from the incident surface of the reflection member to the reflection surface of the reflection member. Thus, the optical imaging system may have a reduced size.

[0108] In an embodiment, the optical imaging system may satisfy the conditional expression 1 < fG2 / f < 1.5. Here, fG2 may be the focal length of the second lens group. Thus, the optical imaging system may have a reduced size and improved resolution.

[0109] In an embodiment, the optical imaging system may satisfy the conditional expression 4 < fG1 / fG2 < 8. Thus, by appropriately distributing the refractive power of each lens group, the optical imaging system may have a reduced size and improved resolution.

[0110] Reference may be made to Figure 1 and Figure 2 to describe the optical imaging system 100 according to the first embodiment.

[0111] The optical imaging system 100 according to the first embodiment may include a first lens group LG1 and a second lens group LG2. In addition, the optical imaging system 100 may include a reflection member P disposed between the first lens group LG1 and the second lens group LG2.

[0112] The first lens group LG1 may include a first lens 110, and the second lens group LG2 may sequentially include a second lens 120, a third lens 130, a fourth lens 140, and a fifth lens 150 from the object side.

[0113] In addition, the optical imaging system 100 may further include a filter IF and an image sensor IS.

[0114] The optical imaging system 100 according to the first embodiment may form a focus on the imaging plane IP. The imaging plane IP may refer to the surface on which the optical imaging system 100 forms a focus. As an example, the imaging plane IP may refer to one surface of the image sensor IS on which light is received.

[0115] The reflection member P may be implemented as a prism or may be provided as a mirror.

[0116] The lens characteristics (radius of curvature, thickness of the lens or distance between lenses, refractive index, Abbe number, effective radius, and focal length) of each lens are listed in Table 1.

[0117] Table 1

[0118]

[0119]

[0120] The total focal length f of the optical imaging system 100 according to the first embodiment is 10.7023 mm, Fno is 2.250, FOV (field of view of the optical imaging system) is 33.594°, IMG HT is 3.269 mm, SDP is 4.7 mm, and ET5 is 0.750 mm.

[0121] The focal length of the second lens group LG2 is 11.405 mm.

[0122] In the first embodiment, the first lens 110 may have positive refractive power, the object-side surface of the first lens 110 may be convex, and the image-side surface of the first lens 110 may be concave.

[0123] The second lens 120 may have positive refractive power, and the object-side surface and the image-side surface of the second lens 120 may be convex.

[0124] The third lens 130 may have negative refractive power, an object-side surface of the third lens 130 may be convex, and an image-side surface of the third lens 130 may be concave.

[0125] The fourth lens 140 may have positive refractive power, an object-side surface of the fourth lens 140 may be concave, and an image-side surface of the fourth lens 140 may be convex.

[0126] The fifth lens 150 may have positive refractive power, the object-side surface of the fifth lens 150 may be convex, and the image-side surface of the fifth lens 150 may be concave.

[0127] Each surface of the first to fifth lenses 110 to 150 may have an aspheric surface coefficient as in Table 2. For example, the object-side surface and the image-side surface of each of the first to fifth lenses 110 to 150 may be aspheric surfaces.

[0128] Table 2

[0129]

[0130]

[0131] In addition, the optical imaging system 100 configured as above may have the following features: Figure 2 Aberration characteristics shown in .

[0132] You can refer to Figure 3 and Figure 4 An optical imaging system 200 according to a second embodiment is described.

[0133] The optical imaging system 200 according to the second embodiment may include a first lens group LG1 and a second lens group LG2 . In addition, the optical imaging system 200 may include a reflective member P disposed between the first lens group LG1 and the second lens group LG2 .

[0134] The first lens group LG1 may include a first lens 210 , and the second lens group LG2 may include a second lens 220 , a third lens 230 , a fourth lens 240 , and a fifth lens 250 in order from the object side.

[0135] In addition, the optical imaging system 200 may further include an optical filter IF and an image sensor IS.

[0136] The optical imaging system 200 according to the second embodiment can form a focus on an imaging plane IP. The imaging plane IP may refer to a surface on which a focus is formed by the optical imaging system 200. As an example, the imaging plane IP may refer to one surface of the image sensor IS on which light is received.

[0137] The reflective member P may be implemented as a prism, or may be provided as a reflecting mirror.

[0138] Table 3 lists the lens characteristics of each lens (curvature radius, thickness of the lens or distance between lenses, refractive index, Abbe number, effective radius, and focal length).

[0139] Table 3

[0140]

[0141]

[0142] The total focal length f of the optical imaging system 200 according to the second embodiment is 10.7028 mm, Fno is 2.238, FOV is 33.495°, IMG HT is 3.269 mm, SDP is 4.8 mm, and ET5 is 0.632 mm.

[0143] The focal length of the second lens group LG2 is 11.402 mm.

[0144] In the second embodiment, the first lens 210 may have positive refractive power, the object-side surface of the first lens 210 may be convex, and the image-side surface of the first lens 210 may be concave.

[0145] The second lens 220 may have positive refractive power, and the object-side surface and the image-side surface of the second lens 220 may be convex.

[0146] The third lens 230 may have negative refractive power, the object-side surface of the third lens 230 may be convex, and the image-side surface of the third lens 230 may be concave.

[0147] The fourth lens 240 may have positive refractive power, an object-side surface of the fourth lens 240 may be concave, and an image-side surface of the fourth lens 240 may be convex.

[0148] The fifth lens 250 may have positive refractive power, the object-side surface of the fifth lens 250 may be convex, and the image-side surface of the fifth lens 250 may be concave.

[0149] Each surface of the first to fifth lenses 210 to 250 may have an aspherical surface coefficient as in Table 4. For example, the object-side surface and the image-side surface of each of the first to fifth lenses 210 to 250 may be aspherical surfaces.

[0150] Table 4

[0151]

[0152]

[0153] In addition, the optical imaging system 200 configured as above may have Figure 4 Aberration characteristics shown in .

[0154] You can refer to Figure 5 and Figure 6 An optical imaging system 300 according to a third embodiment is described.

[0155] The optical imaging system 300 according to the third embodiment may include a first lens group LG1 and a second lens group LG2 . In addition, the optical imaging system 300 may include a reflective member P disposed between the first lens group LG1 and the second lens group LG2 .

[0156] The first lens group LG1 may include a first lens 310 , and the second lens group LG2 may include a second lens 320 , a third lens 330 , a fourth lens 340 , and a fifth lens 350 in order from the object side.

[0157] In addition, the optical imaging system 300 may further include an optical filter IF and an image sensor IS.

[0158] The optical imaging system 300 according to the third embodiment can form a focus on an imaging plane IP. The imaging plane IP may refer to a surface on which a focus is formed by the optical imaging system 300. As an example, the imaging plane IP may refer to one surface of the image sensor IS on which light is received.

[0159] The reflective member P may be implemented as a prism, or may be provided as a reflecting mirror.

[0160] Table 5 lists the lens characteristics of each lens (curvature radius, thickness of the lens or distance between lenses, refractive index, Abbe number, effective radius, and focal length).

[0161] Table 5

[0162] Face number element Radius of curvature Thickness or distance Refractive index Abbe number Effective radius focal length S1 First lens 17.748 1.000 1.535 55.7 3.500 76.8593 S2 30.619 0.800 3.354 S3 Prism infinity 2.400 1.717 29.5 S4 infinity 2.400 1.717 29.5 S5 infinity 2.500 S6 Second lens 2.889 1.501 1.535 55.7 2.100 4.6803 S7 -15.366 0.100 2.000 S8 The third lens 8.090 0.584 1.614 25.9 1.762 -4.5321 S9 2.015 1.938 1.384 S10 Fourth lens -3.099 0.578 1.671 19.2 1.500 -222.795 S11 -3.402 0.106 1.580 S12 Fifth lens 3.088 0.800 1.614 25.9 1.750 20.7966 S13 3.671 2.000 1.950 S14 filter infinity 0.210 1.517 64.2 4.000 S15 infinity 2.095 2.714 S16 Imaging surface infinity

[0163] The optical imaging system 300 according to the third embodiment has a total focal length f of 10.7063 mm, an Fno of 2.271, a FOV of 33.425°, an IMG HT of 3.277 mm, an SDP of 4.8 mm, and an ET5 of 0.750 mm.

[0164] The focal length of the second lens group LG2 is 11.410 mm.

[0165] In the third embodiment, the first lens 310 may have positive refractive power, the object-side surface of the first lens 310 may be convex, and the image-side surface of the first lens 310 may be concave.

[0166] The second lens 320 may have positive refractive power, and the object-side surface and the image-side surface of the second lens 320 may be convex.

[0167] The third lens 330 may have negative refractive power, an object-side surface of the third lens 330 may be convex, and an image-side surface of the third lens 330 may be concave.

[0168] The fourth lens 340 may have negative refractive power, an object-side surface of the fourth lens 340 may be concave, and an image-side surface of the fourth lens 340 may be convex.

[0169] The fifth lens 350 may have positive refractive power, the object-side surface of the fifth lens 350 may be convex, and the image-side surface of the fifth lens 350 may be concave.

[0170] Each surface of the second to fifth lenses 320 to 350 may have an aspheric surface coefficient as shown in Table 6. For example, the object-side surface and the image-side surface of each lens except the first lens 310 may be aspheric, and the object-side surface and the image-side surface of the first lens 310 may be spherical.

[0171] Table 6

[0172]

[0173]

[0174] In addition, the optical imaging system 300 configured as above may have the following features: Figure 6 Aberration characteristics shown in .

[0175] You can refer to Figure 7 and Figure 8 An optical imaging system 400 according to a fourth embodiment is described.

[0176] The optical imaging system 400 according to the fourth embodiment may include a first lens group LG1 and a second lens group LG2 . In addition, the optical imaging system 400 may include a reflective member P disposed between the first lens group LG1 and the second lens group LG2 .

[0177] The first lens group LG1 may include a first lens 410 , and the second lens group LG2 may include a second lens 420 , a third lens 430 , a fourth lens 440 , and a fifth lens 450 in order from the object side.

[0178] In addition, the optical imaging system 400 may further include an optical filter IF and an image sensor IS.

[0179] The optical imaging system 400 according to the fourth embodiment can form a focus on an imaging plane IP. The imaging plane IP may refer to a surface on which a focus is formed by the optical imaging system 400. As an example, the imaging plane IP may refer to one surface of the image sensor IS on which light is received.

[0180] The reflective member P may be implemented as a prism, or may be provided as a reflecting mirror.

[0181] Table 7 lists the lens characteristics of each lens (curvature radius, thickness of the lens or distance between lenses, refractive index, Abbe number, effective radius, and focal length).

[0182] Table 7

[0183] Face number element Radius of curvature Thickness or distance Refractive index Abbe number Effective radius focal length S1 First lens 17.844 0.900 1.535 55.7 3.500 80.2661 S2 30.000 0.900 3.370 S3 Prism infinity 2.400 1.717 29.5 S4 infinity 2.400 1.717 29.5 S5 infinity 2.400 S6 Second lens 2.948 1.714 1.535 55.7 2.100 4.6079 S7 -11.977 0.100 1.906 S8 The third lens 11.708 0.612 1.614 25.9 1.719 -4.2078 S9 2.076 1.790 1.362 S10 Fourth lens -2.788 0.536 1.671 19.2 1.500 626.293 S11 -2.983 0.100 1.618 S12 Fifth lens 2.998 0.589 1.614 25.9 1.810 19.0396 S13 3.729 0.825 1.950 S14 filter infinity 0.210 1.517 64.2 4.123 S15 infinity 3.554 4.123 S16 Imaging surface infinity

[0184] The total focal length f of the optical imaging system 400 according to the fourth embodiment is 10.7081 mm, Fno is 2.269, FOV is 32.232°, IMG HT is 3.269 mm, SDP is 4.8 mm, and ET5 is 0.518 mm.

[0185] The focal length of the second lens group LG2 is 11.311 mm.

[0186] In the fourth embodiment, the first lens 410 may have positive refractive power, the object-side surface of the first lens 410 may be convex, and the image-side surface of the first lens 410 may be concave.

[0187] The second lens 420 may have positive refractive power, and the object-side surface and the image-side surface of the second lens 420 may be convex.

[0188] The third lens 430 may have negative refractive power, an object-side surface of the third lens 430 may be convex, and an image-side surface of the third lens 430 may be concave.

[0189] The fourth lens 440 may have positive refractive power, an object-side surface of the fourth lens 440 may be concave, and an image-side surface of the fourth lens 440 may be convex.

[0190] The fifth lens 450 may have positive refractive power, an object-side surface of the fifth lens 450 may be convex, and an image-side surface of the fifth lens 450 may be concave.

[0191] Each surface of the first to fifth lenses 410 to 450 may have an aspheric surface coefficient as in Table 8. For example, the object-side surface and the image-side surface of each of the first to fifth lenses 410 to 450 may be aspheric surfaces.

[0192] Table 8

[0193]

[0194]

[0195] The optical imaging system 400 configured as above may have the following features: Figure 8 Aberration characteristics shown in .

[0196] You can refer to Figure 9 and Figure 10 An optical imaging system 500 according to a fifth embodiment will be described.

[0197] The optical imaging system 500 according to the fifth embodiment may include a first lens group LG1 and a second lens group LG2 . In addition, the optical imaging system 500 may include a reflective member P disposed between the first lens group LG1 and the second lens group LG2 .

[0198] The first lens group LG1 may include a first lens 510 , and the second lens group LG2 may include a second lens 520 , a third lens 530 , a fourth lens 540 , and a fifth lens 550 in order from the object side.

[0199] In addition, the optical imaging system 500 may further include an optical filter IF and an image sensor IS.

[0200] The optical imaging system 500 according to the fifth embodiment can form a focus on an imaging plane IP. The imaging plane IP may refer to a surface on which a focus is formed by the optical imaging system 500. As an example, the imaging plane IP may refer to one surface of the image sensor IS on which light is received.

[0201] The reflective member P may be implemented as a prism, or may be provided as a reflecting mirror.

[0202] Table 9 lists the lens characteristics of each lens (curvature radius, thickness of the lens or distance between lenses, refractive index, Abbe number, effective radius, and focal length).

[0203] Table 9

[0204]

[0205]

[0206] The optical imaging system 500 according to the fifth embodiment has a total focal length f of 10.7081 mm, an Fno of 2.160, a FOV of 33.373°, an IMG HT of 3.269 mm, an SDP of 4.8 mm, and an ET5 of 1.170 mm.

[0207] The focal length of the second lens group LG2 is 10.788 mm.

[0208] In the fifth embodiment, the first lens 510 may have positive refractive power, the object-side surface of the first lens 510 may be convex, and the image-side surface of the first lens 510 may be concave.

[0209] The second lens 520 may have positive refractive power, and the object-side surface and the image-side surface of the second lens 520 may be convex.

[0210] The third lens 530 may have positive refractive power, an object-side surface of the third lens 530 may be convex, and an image-side surface of the third lens 530 may be concave.

[0211] The fourth lens 540 may have negative refractive power, the object-side surface of the fourth lens 540 may be convex, and the image-side surface of the fourth lens 540 may be concave.

[0212] The fifth lens 550 may have positive refractive power, an object-side surface of the fifth lens 550 may be concave, and an image-side surface of the fifth lens 550 may be convex.

[0213] Each surface of the first to fifth lenses 510 to 550 may have an aspheric surface coefficient as in Table 10. For example, the object-side surface and the image-side surface of each of the first to fifth lenses 510 to 550 may be aspheric surfaces.

[0214] Table 10

[0215]

[0216]

[0217] The optical imaging system 500 configured as above may have Figure 10 Aberration characteristics shown in .

[0218] You can refer to Figure 11 and Figure 12 An optical imaging system 600 according to a sixth embodiment is described.

[0219] The optical imaging system 600 according to the sixth embodiment may include a first lens group LG1 and a second lens group LG2 . In addition, the optical imaging system 600 may include a reflective member P disposed between the first lens group LG1 and the second lens group LG2 .

[0220] The first lens group LG1 may include a first lens 610 , and the second lens group LG2 may include a second lens 620 , a third lens 630 , a fourth lens 640 , and a fifth lens 650 in order from the object side.

[0221] In addition, the optical imaging system 600 may further include an optical filter IF and an image sensor IS.

[0222] The optical imaging system 600 according to the sixth embodiment can form a focus on an imaging plane IP. The imaging plane IP may refer to a surface on which a focus is formed by the optical imaging system 600. As an example, the imaging plane IP may refer to one surface of the image sensor IS on which light is received.

[0223] The reflective member P may be implemented as a prism, or may be provided as a reflecting mirror.

[0224] Table 11 lists the lens characteristics of each lens (curvature radius, thickness of the lens or distance between lenses, refractive index, Abbe number, effective radius, and focal length).

[0225] Table 11

[0226]

[0227]

[0228] The total focal length f of the optical imaging system 600 according to the sixth embodiment is 10.7084 mm, Fno is 2.149, FOV is 30.297°, IMG HT is 3.269 mm, SDP is 4.7 mm, and ET5 is 0.722 mm.

[0229] The focal length of the second lens group LG2 is 10.976 mm.

[0230] In the sixth embodiment, the first lens 610 may have positive refractive power, the object-side surface of the first lens 610 may be convex, and the image-side surface of the first lens 610 may be concave.

[0231] The second lens 620 may have positive refractive power, the object-side surface of the second lens 620 may be convex, and the image-side surface of the second lens 620 may be concave.

[0232] The third lens 630 may have positive refractive power, an object-side surface of the third lens 630 may be convex, and an image-side surface of the third lens 630 may be concave.

[0233] The fourth lens 640 may have negative refractive power, the object-side surface of the fourth lens 640 may be convex, and the image-side surface of the fourth lens 640 may be concave.

[0234] The fifth lens 650 may have positive refractive power, an object-side surface of the fifth lens 650 may be concave, and an image-side surface of the fifth lens 650 may be convex.

[0235] Each surface of the first to fifth lenses 610 to 650 may have an aspheric surface coefficient as in Table 12. For example, the object-side surface and the image-side surface of each of the first to fifth lenses 610 to 650 may be aspheric surfaces.

[0236] Table 12

[0237] S1 S2 S6 S7 S8 Conic constant (K) 1.2302E-01 -3.2309E-01 0.0000E+00 0.0000E+00 -3.0107E+00 Fourth-order coefficient (A) 4.3660E-04 4.3382E-04 -1.5734E-03 -4.0061E-04 7.5438E-04 Sixth-order coefficient (B) 2.0104E-05 2.3242E-05 7.3894E-05 1.5512E-04 -1.2268E-04 Eighth-order coefficient (C) 1.6772E-07 8.6076E-07 -6.2268E-06 4.2344E-05 -7.6159E-05 Tenth-order coefficient (D) -8.1261E-09 -5.0570E-08 -1.5927E-06 -2.4529E-06 2.8834E-06 Twelfth-order coefficient (E) -1.3775E-09 -7.2866E-09 1.3157E-07 -1.3976E-06 4.1240E-06 Fourteenth-order coefficient (F) -1.5927E-10 -4.9189E-10 1.8828E-07 8.5131E-07 -2.0485E-08 Sixteenth-order coefficient (G) 7.3462E-12 3.5619E-11 0.0000E+00 0.0000E+00 -5.2181E-09 Eighteenth-order coefficient (H) -7.0502E-13 1.3500E-12 0.0000E+00 0.0000E+00 3.3276E-10 Twentieth-order coefficient (J) 3.3270E-14 -8.1025E-14 0.0000E+00 0.0000E+00 3.6468E-20 S9 S10 S11 S12 S13 Conic constant (K) 2.0000E+01 -2.0000E+01 -5.4774E-02 -4.7896E+00 -1.2126E-01 Fourth-order coefficient (A) 2.1667E-03 -1.2014E-03 9.9266E-03 5.4905E-03 4.1607E-03 Sixth-order coefficient (B) 4.1875E-04 3.4411E-05 -4.2262E-04 6.5569E-04 1.8501E-04 Eighth-order coefficient (C) 8.2257E-05 5.1710E-05 7.7974E-05 5.0831E-05 -6.1143E-05 Tenth-order coefficient (D) 4.5977E-07 4.1161E-05 -1.7356E-05 1.2207E-04 -4.6225E-06 Twelfth-order coefficient (E) 3.4991E-06 1.9074E-06 3.5481E-05 -2.5747E-05 3.5227E-06 Fourteenth-order coefficient (F) 5.6783E-06 3.7405E-07 -1.5605E-05 5.0400E-06 6.8656E-07 Sixteenth-order coefficient (G) -1.0454E-18 7.9919E-18 1.3785E-18 -6.7482E-17 -6.7744E-09 Eighteenth-order coefficient (H) -4.6275E-19 3.4967E-19 -4.8052E-20 -3.3055E-18 1.4910E-08 Twentieth-order coefficient (J) -2.5856E-20 2.8049E-21 -1.1124E-20 -5.5547E-20 6.5625E-18

[0238] The optical imaging system 600 configured as above may have the following features: Figure 12 Aberration characteristics shown in .

[0239] Table 13

[0240]

[0241]

[0242] According to the above-described embodiment, the size of the optical imaging system can be reduced, and a high-resolution image can be captured.

[0243] Although specific examples have been shown and described above, it will be apparent after understanding this disclosure that various changes in form and detail may be made to these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein are to be understood in a descriptive sense only and not for purposes of limitation. The description of features or aspects in each example should be considered applicable to similar features or aspects in other examples. Appropriate results may still be achieved if the described techniques are performed in a different order, and / or if components in the described systems, architectures, devices, or circuits are combined in different ways and / or replaced or supplemented by other components or their equivalents. Therefore, the scope of this disclosure is not limited by the specific embodiments, but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents should be understood to be included in this disclosure.

Claims

1. An optical imaging system, characterized in that The optical imaging system includes: A first lens group, including one or more lenses and having a positive refractive power; A second lens group, including a plurality of lenses; and A reflecting member, disposed between the first lens group and the second lens group, and including an incident surface, a reflecting surface, and an exit surface, where 1.3 < SD1 / SDP < 1.7, where SD1 is the effective diameter of the object side surface of the first lens disposed closest to the object side among the one or more lenses of the first lens group, and SDP is the short axis length of the incident surface of the reflecting member.

2. The optical imaging system according to claim 1, wherein: The reflecting member and the first lens group are configured to rotate together about two axes perpendicular to each other.

3. The optical imaging system according to claim 2, wherein: The two axes are perpendicular to the optical axis of the second lens group.

4. The optical imaging system according to claim 1, wherein: 2.1 < f / SDP < 2.4 is satisfied, where f is the total focal length of the optical imaging system.

5. The optical imaging system according to claim 1, wherein: 0.6 < IMG HT / BFL < 0.8 is satisfied, where IMG HT is half of the diagonal length of the imaging surface, and BFL is the distance from the image side surface of the lens disposed closest to the imaging surface among the plurality of lenses of the second lens group to the imaging surface.

6. The optical imaging system according to claim 1, wherein: 0.2 < |R10 / f| < 0.5 is satisfied, where R10 is the radius of curvature of the image side surface of the lens disposed closest to the imaging surface among the plurality of lenses of the second lens group, and f is the total focal length of the optical imaging system.

7. The optical imaging system according to claim 1, wherein: 1.0 < Lf / IMG HT < 1.5 is satisfied, where Lf is the distance from the object side surface of the first lens to the reflecting surface of the reflecting member, and IMG HT is half of the diagonal length of the imaging surface.

8. The optical imaging system according to claim 1, wherein: 4.0 < fG1 / f < 8.0 is satisfied, where fG1 is the focal length of the first lens group, and f is the total focal length of the optical imaging system.

9. The optical imaging system according to claim 1, wherein: |(R1 - R2) / (R1 + R2)| < 0.4 is satisfied, where R1 is the radius of curvature of the object side surface of the first lens, and R2 is the radius of curvature of the image side surface of the first lens.

10. The optical imaging system according to claim 1, wherein: 1.2 < SD1 / BFL < 1.9 is satisfied, where BFL is the distance from the image side surface of the lens disposed closest to the imaging surface among the plurality of lenses of the second lens group to the imaging surface.

11. The optical imaging system according to claim 1, wherein: 0.9 < CT5 / ET5 < 1.8 is satisfied, where CT5 is the thickness on the optical axis of the lens disposed closest to the imaging surface among the plurality of lenses of the second lens group, and ET5 is the thickness at the end of the effective diameter of the lens disposed closest to the imaging surface among the plurality of lenses of the second lens group.

12. The optical imaging system according to claim 1, wherein: The Abbe number of the first lens is greater than the Abbe number of the reflecting member.

13. The optical imaging system according to claim 1, It is characterized by: The second lens group has a positive refractive power, and where the focal length of the second lens group is less than the focal length of the first lens group.

14. The optical imaging system according to claim 1, wherein: 4 < fG1 / fG2 < 8 is satisfied, where fG1 is the focal length of the first lens group, and fG2 is the focal length of the second lens group.

15. The optical imaging system according to claim 1, wherein: A lens disposed closest to the reflecting member among the plurality of lenses of the second lens group has positive refractive power.

16. The optical imaging system according to claim 1, wherein: The first lens group includes the first lens, and the object-side surface of the first lens is convex, and the image-side surface of the first lens is concave.

Images